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Timing Method for Detecting Plosives

IP.com Disclosure Number: IPCOM000093806D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Ferrier, HA: AUTHOR

Abstract

This plosive detector for speech recognition detects whether the received speech wave 10 remains above a specified voltage level for 15 ms. or more. In effect it is a low-frequency detector. When the input audio signal 10 rises above 0. 7 volts transistor Q1 saturates cutting off transistor Q2. If Q1 remains saturated for 15 ms., the timing network comprising resistor 11 and capacitor 12 times out, allowing Q2 to saturate. With both Q1 and Q2 driven to saturation, the current through resistances 13 and 14 drops so that Q3 no longer remains saturated. The voltage at output terminal 15 therefore goes positive, indicating a plosive.

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Timing Method for Detecting Plosives

This plosive detector for speech recognition detects whether the received speech wave 10 remains above a specified voltage level for 15 ms. or more. In effect it is a low-frequency detector. When the input audio signal 10 rises above
0. 7 volts transistor Q1 saturates cutting off transistor Q2. If Q1 remains saturated for 15 ms., the timing network comprising resistor 11 and capacitor 12 times out, allowing Q2 to saturate. With both Q1 and Q2 driven to saturation, the current through resistances 13 and 14 drops so that Q3 no longer remains saturated. The voltage at output terminal 15 therefore goes positive, indicating a plosive.

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